If Oregon wants to be in the National Championship, 2 things need to happen.

1, A win over Oregon State. This will be a crucial game for Oregon. If they win they need another thing to happen.
2. USC beating Notre Dame. If USC can knock off USC, Notre Dames BCS dream will crumble, and all Oregon has to do is watch Alabama or Georgia to lose.

It won't be easy for either USC or Notre Dame. And regarding Pac-12, I'd say UCLA should drop the first game against Stanford, cause if UCLA loses, they would have to play them again in the Pac 12 championship, and THEN they can beat Stanford. Man, this week will be intense, especially in Pac-12 play.